Portable sawmill



FIG. 1 is front right perspective view of the portable sawmill showing my new design;

FIG. 2 is a rear right perspective view thereof;

FIG. 3 is a front left perspective view thereof;

FIG. 4 is a rear left perspective view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a front elevation view thereof;

FIG. 7 is a rear elevation view of my new design;

FIG. 8 is a right elevation view of my new design; and,

FIG. 9 is a left elevation view of my new design.

Parts of the design shown in broken lines in the figures are for illustrative purposes only and form no part of the claimed design. 

I claim the ornamental design for a portable sawmill, as shown and described. 